粗骨料最大粒径对再生混凝土强度影响

Influence of Maximum Particle Size of Coarse Aggregate on Strength of Recycled Concrete

试验选用粗骨料粒径分别为5~16 mm、5~20 mm、5~25 mm、5~31.5 mm和5~40mm的再生混凝土试块为研究对象,对其进行混凝土抗压试验,测定不同龄期的再生混凝土的抗压强度,并对其结果进行分析。试验结果表明,随着粗骨料粒径的增大,混凝土强度先增大后减小,在粒径为5~20mm时,其强度最高;粗骨料粒径对再生混凝土的早期强度的变化规律影响不大,并且再生混凝土的早期强度比普通混凝土强度略有下降。

Recycled concrete blocks with particle size of coarse aggregate sizes are 5-16 mm,5-20 mm,5-25 mm,5-31.5mm and 5-40 mm respectively were used to do compression tests.The compression strength of recycled concrete in different ages was determined,and the results were analyzed.The results show that the strength of concrete varies from strong to weak with the increase of particle sizes of coarse aggregate,when the size is 5-20 mm,strength is highest.The particle size of coarse aggregate size has little effect on the changing rule of recycled concrete strength at early stage,and the strength of recycled concrete at early stage is slightly lower than that of the normal concrete strength.